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Performance Verification
4–32
AM700 Audio Measurement Set Service Manual
11. Press the Average button to turn off Hold Maximum in the active view.
12. Touch the view 1 screen area and and press the Average button. Observe that
the noise floor with no averaging is less than –130 dBu.
Input Impedance Verification
These checks verify the input impedances of the Audio Analyzer on channel A
and channel B.
1. Set the external generator to output a 1 kHz sine wave, and set the generator
output to 0.775 V.
2. Set the source resistance of the generator to 600 W.
1. If not already in the Audio Analyzer application, start the Audio Analyzer
application.
2. Make sure that the input configuration is using High Resolution mode.
3. Set the AM700 input configuration for Front panel A and B.
4. Set the input range for channels A and B to +2 dBu (0.95 V).
5. Set the Input Impedance for channels A and B to 200 kW.
1. Connect the output of the external generator to the Channel A input of the
AM700.
2. The input should read approximately 0 dBu.
3. On the AM700, set the Input Impedance to 600 W.
4. Check to see that the measured level has dropped to approximately –6 dBu.
5. On the AM700, set the Input Impedance to 150 W.
6. Check to see that the measured level has dropped to approximately –14 dBu.
7. Verify Channel B is the same manner as Channel A.
Set Up the Generator
Set Up the AM700
Audio Analyzer
Verify Ch B and Ch B
Input Impedance